Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.2: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Giant 2p→3d Resonant Photoemission of Half-Metallic Ferromagnetic CrO₂ — •Yuriy Dedkov¹, Mikhail Fonin¹, Martin Sperlich¹, Christian König¹, Alexandr Vinogradov², Denis Vyalikh³, Serguei Molodtsov³, Ulrich Rüdiger⁴, and Gernot Güntherodt¹ — ¹II. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany — ²Institute of Physics, St.-Petersburg State University, 198904 St.-Petersburg, Russia — ³Institut für Festköperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — ⁴Fachbereich Physik, Universität Konstanz, D-78457, Konstanz, Germany

The electronic structure of high quality half-metallic ferromagnetic CrO₂(100) films was investigated by means of x-ray adsorption spectroscopy (XAS) and resonance photoelectron spectroscopy (Res-PES) performed at the O K- and Fe L_2,3-edges. First principles calculations made on the basis of the local spin-density approximation (LSDA and LSDA+U) to the density-functional theory have been carried out to study the influence of the electron correlation effects on the electronic structure of CrO₂. Recent resonance photoelectron spectroscopy data emphasize the strength of 2p-3d resonance photoemission for studying the electronic structure of correlated systems, for example CrO₂. The present spectroscopy data (XAS and Res-PES) show that band structure calculations on the basis of the LSDA+U approach are more suitable for the description of the electronic structure of half-metallic CrO₂.